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Home NEWS Science News Biology

The best way to take pills according to science

Bioengineer by Bioengineer
August 15, 2022
in Biology
Reading Time: 3 mins read
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When you have a headache and reach for the pain reliever, you’re probably not thinking about your body position when you take the pill. But a new Johns Hopkins University study finds your posture can make a big difference—as much as an hour longer—in how fast your body absorbs the medicine.

How Posture Affects Taking Pills

Credit: Khamar Hopkins/Johns Hopkins University

When you have a headache and reach for the pain reliever, you’re probably not thinking about your body position when you take the pill. But a new Johns Hopkins University study finds your posture can make a big difference—as much as an hour longer—in how fast your body absorbs the medicine.

The findings are based on what’s thought to be the first model to simulate the mechanics of drug dissolution on a human stomach.

“We were very surprised that posture had such an immense effect on the dissolution rate of a pill,” said senior author Rajat Mittal, a Johns Hopkins engineer and an expert in fluid dynamics. “I never thought about whether I was doing it right or wrong but now I’ll definitely think about it every time I take a pill.”

The work is newly published in Physics of Fluids.

In recent years models have been created to authentically represent the workings of several major organs, notably the heart. The model developed by the team, called StomachSim, appears to be one of the first to be able to conduct realistic simulation of the human stomach. Blending physics with biomechanics and fluid mechanics, StomachSim mimics what happening inside a stomach as it digests food, or in this case, medicine.

Most pills do not start working until the stomach ejects their contents into the intestine. So the closer a pill lands to the last part of the stomach, the antrum, the faster it starts to dissolve and empty its contents through the pylorus into the duodenum, the first part of the small intestine. If you’re aiming a pill for this part of the stomach, posture is critical to play into both gravity and the natural asymmetry of the stomach.

The team tested four postures. Taking pills while lying on the right side was by far the best, sending pills into the deepest part of the stomach to achieve a dissolution rate 2.3 times faster than even an upright posture. Lying on the left side was the worst. The team was very surprised to find that if a pill takes 10 minutes to dissolve on the right side, it could take 23 minutes to dissolve in an upright posture and over 100 minutes when laying on the left side.

“For elderly, sedentary or bedridden people, whether they’re turning to left or to the right can have a huge impact,” Mittal said.

Standing upright was a decent second choice, essentially tied in effectiveness with lying straight back.

The team also considered what stomachs that aren’t functioning at full strength due to gastroparesis caused by diseases such as diabetes and Parkinson’s Syndrome meant for pill dissolution. Even a small change in the conditions of the stomach can lead to significant differences in the outcome of an oral drug, said lead author Jae Ho “Mike” Lee, a former postdoctoral researcher at Johns Hopkins.

The impact of stomach disease on drug dissolution was similar to that of posture—which underscores how significant a difference posture makes.

“Posture itself has such a huge impact it, it’s equivalent to somebody’s stomach having a very significant disfunction as far as pill dissolution is concerned,” Mittal said.

Future work will attempt to predict how the changes in the biomechanics of the stomach affect how the body absorbs drugs, how food is processed in the stomach and the effect of posture and gastroparesis on food digestion.

Johns Hopkins authors included: PhD student Sharun Kuhar; associate research professor Jung-Hee Seo; and Jay Pasricha, professor of medicine.

The work was supported by National Science Foundation CBET 2019405 and National Institutes of Health 5R21GM139073-02.



Journal

Physics of Fluids

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